The thing that most worries me is that, if Reform are taking their stance from the Republicans under Trump, then they won't respect democracy when they get in, and we won't be able to vote them out again.
I don't know how many of their supporters have thought about it from this angle - I suspect most of them haven't.
Basically, we have no evidence that Reform will act as a loyal opposition - as the Tories, Labour, or any other major party would - and lots of evidence they will be looking to subvert the institutions so they can never be kicked out, by an election at least.
They make alot of flaunting that they are willing to make the same sorts of decisions as Trump's Republicans. Well, if they say that, we should assume they are also willing to undermine democracy.
Basically, if you have, or are considering voting Reform, just think on that. Are you sure you would not be helping to take away the vote from everyone else, and yourself, ultimately. If you know someone thinking to vote Reform, please bring this up with them.